PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Ethanedioic acid, dimethyl ester 553-90-2
15.01
15.02
Formula Synonyms
C4.H6.O4
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
118.089 S 163.5 1.148
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
4.7 52 310
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
0.97 11 64
Technical Basis
A review of limited sources identified rat oral LD50 toxicity data that was selected as the TEEL-3 basis and evaluated using factors in Tables 3.2, 3.3, and 3.4. TEEL-1 and TEEL-2 values were derived according to Table 3.5.
• PAC-1 = TEEL-1 = TEEL-2/11
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = Rat oral LD50 (1569 mg/kg)
This review generated PAC values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 basis was rat oral LDLo study that was not identified during this review. Instead, a higher priority rat oral LD50 was found and selected as the TEEL-3 basis. The TEEL-2 and TEEL-1 methodology remains consistent, with the difference in values due to the change of the TEEL-3 basis.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Dimethyl-oxalate
Rat LD50: https://chem.echa.europa.eu/100.008.231/dossier-view/613cb36e-a7d1-41e2-9e03-5ad913d18fb7/37d8ed72-1587-4d54-8f3b-d3e13e9fc3a1_396d3783-a8c5-4ce7-882a-3f951c516499?searchText=553-90-2
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PAC values marked with a subscript "A" correspond to 60-minute AEGL values.
PAC values marked with a subscript "E" correspond to ERPG values.
PAC values marked by * are >= 10% lower explosive limit (LEL) but < 50% LEL.
PAC values marked by ** are > 50% LEL but < 100% LEL.
PAC values marked by *** are >= LEL.